Screw-cutting attachment for lathes.



No. 662,|88. I Patent-ed Nov. 20, I900. J. CIJRNELIS.

SCREW CUTTING ATTACHMENT FOR LTATHES.

(Application filed Jan; 15, 1900.)

(No Model.)

Wz-z rzessfia "m: Nrmms PETERS co, pumoumu, WASHINGTON, o. c,

Miran Frames JEAN ooRNELIs, or LIEGE, BELGIUM.

SCREW=CUTTING ATTACHMENT FOR LATHES.

SPECIFICATION forming part of Letters Patent No. 662,188, dated November20, 1900.

Application filed January 15, 1900. Serial No. 1,486. \No model.)

To all whom it may concern.-

Be it known that I, JEAN CORNELIS, a subject of the King of Belgium,residing at- Liege, Belgium, have invented certain new and usefulImprovements in Screw-Cutting Attachments for Lathes; and I do herebydeclare the following to be a full, clear, and exact description of theinvention, such as will enable others skilled in the art to which itappertains to make and use the same.

The object of the present invention is an apparatus or attachment forscrew-cutting capable of being fitted to any lathe and of finishing atone operation any screw-thread, whatever its form, depth, and pitch maybe, completely and automatically.

In the annexed drawings only the saddle and tool-rest, together with anendless screw intended to work the tool, are shown. This endless screwis preferably set in motion by gearing controlled by the lathe. Thisgearing as well as the endless screw to move the saddle forward and tomove the tool-rest support have no especial features and are not shownin the drawings.

Figure 1 isa plan view, Fig. 2 a lateral view, and Fig. 3 a section fromA to'B, Fig. 1, of the saddle with the tool-rest. In Figs. 1 and 3 thetool is removed to facilitate the comprehension of the drawings. Fig. 4:is a plan, and Fig. 5 alateral view, of a circular cuttingtool. Ofcourse this varies according to the shape of the thread to be out;

On one of the longitudinal sides of the lathe and parallel to it thereis an endless screw a, having its bearings in supports which are part ofthe structure and controlled by gearing actuated by the mechanism of thelathe. A worm-wheel 19 engages this endless screw a and transmits itsmovement to the tool. This wheel I) has its bearings in an arm 0,affixed to the saddle d, which arm, surrounding the screw a, serves as aguide for it, Fig. 2. The worm-wheel b is keyed to a shaft f, which atits other end is supported by the tool-rest g and carries the Wheel h,which has tangential teeth and is adjustable only longitudinally alongthis shaft f. This wheel it engages a like toothed wheel 6, keyed on theshaft 1, the upper extremity of which carries either the rotating cutteror tool 11 (shown in Figs. 4 and 5) or any other suitable tool. The tool41 is retained on the shaft Z by a nut 'm or other means.

The work i to be screw-cut being fixed in the lathe at a suitableheight, the mechanism of the lathe is set in motion. The endless screwa, turns and communicates its motion to the wheel I), and thence throughthe shaft f, the wheels h 2', and the shaft Z to the tool a. Thetool-rest g is moved forward in the usual way until the tool comes intocontact with the work to be screw-cut, and after the forward motion hasbeen given to the saddleg in the usual way the lathe is left to itselfand a screw-th read of the required depth is formed at one operation.The forward motion of the tool-rest g has no connection with thescrewthread or its depth.

The tool, which is of disk shape, has on its periphery teeth suitablefor cutting or shaping the screw-thread required.

Owing to the rotation of the tool and the forward movement of the saddlethe teeth of the former get to work successively and remove each a smallportion from the object to be screw-cut.

By means of this lathe attachment any kind of screw-thread may be out.It is onlya question of changing the tool.

Having now particularly described and ascertained the nature of mysaidinvention and in what manner the same is to be performed, I declare thatwhat I claim is- In a screw-cutting attachment for lathes, thecombination with the tool-rest g and the saddle d, movablelongitudinally on the ways of the lathe, of the arm 0 secured to thesaddle, the screw to passing through arm 0 parallel with the work, thehorizontal shaft f 0 journaled in the arm 0 and in the tool-rest atright angles to the screw a, the worm b on shaftfengaging with thethreads of screw a and driven thereby, the vertical shaft Z journaled inthe toolrest, gearing whereby shaft Zis driven by shaft f and the rotarytool n carried by shaft Z, substantially as described.

In testimony whereof I alfix my signature in presence of two witnesses.

JEAN GORNELIS.

Witnesses:

MARoEL REMY, FRANgoIs ABSIF.

